Safety Information | EON800 Tether System

EON800 Tether System Safety Information

The EON800 operates using an 800V DC power tether cable, presenting specific electrical hazards that require careful consideration. The following section outlines potential risks and the best practices for hazard avoidance. While operating any UAV involves inherent risks, following proper procedures can significantly mitigate these risks, although complete elimination may not be possible.

Safety Hazards

• High Voltage Exposure (800V DC): The tether system delivers 800V DC to power the aircraft. This voltage level is inherently dangerous and poses a risk of electric shock or serious injury if contacted.

• Lightweight Cable Construction: To reduce weight, the tether cable uses only a single insulation layer per conductor, along with a Kevlar braid for strength and durability. If the tether cable was damaged, dangerous voltages may become accessible.

• Areas of concern: When the 800V DC system is active, dangerous voltages may be present throughout the tether cable, APU, and connectors. Damage to the tether cable or components could cause dangerous voltage to be transferred to the aircraft. The tether cable, the air power unit, the aircraft, and everything connected to it should be considered dangerous when the 800V DC is operating.

• Residual Charge After Shutdown: When the system is powered off, dangerous voltages may remain in the tether cable and components for up to 30 seconds due to internal capacitance.

• Risk During Fault Conditions or Crashes: In the event of a system fault, disconnection, or crash, hazardous voltage may still be present in the tether or drone until power is fully shut down and dissipated.

Safe Operation Guidelines

1. Inspect Before Each Use

   • Carefully inspect the tether cable, connectors, APU, and TGS for any visible damage damage.

   • Do not operate if damage is found. Contact the manufacturer for guidance.

2. Connection Before Power

   • NEVER power on the TGS until the tether cable is securely connected at both ends (APU and TGS).

3. Handling Rules (During Operation)

   • DO NOT touch the tether cable, APU, aircraft, or parts connected to the aircraft while the 800V DC system is active.

   • If contact is unavoidable, wear insulating gloves rated for at least 1000V.

   • Keep untrained personnel away—use cones or barriers to define a safe perimeter.

4. Power Timing

   • Activate HV power only immediately before takeoff, and shut it off immediately after landing.

5. Emergency & Fault Handling

   • In the event of a crash or system fault, turn off the 800V DC power before the drone contacts the ground.

   • Monitor the system during operation. If any hazard is detected, immediately power down the 800V DC system.

6. Pre-Flight Safety Briefing

   • Provide a short briefing to anyone present around the drone system, especially during demonstrations or field operations.

   • Nominate a tether operator to be responsible for controlling access to the designated safety perimeter and ensuring that no one enters the area while the high-voltage system is active.